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WO2010023257A1 - Device and method for recognizing a position change of vehicle occupants - Google Patents

Device and method for recognizing a position change of vehicle occupants Download PDF

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Publication number
WO2010023257A1
WO2010023257A1 PCT/EP2009/061100 EP2009061100W WO2010023257A1 WO 2010023257 A1 WO2010023257 A1 WO 2010023257A1 EP 2009061100 W EP2009061100 W EP 2009061100W WO 2010023257 A1 WO2010023257 A1 WO 2010023257A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
change
vehicle occupant
vehicle
receiving
Prior art date
Application number
PCT/EP2009/061100
Other languages
German (de)
French (fr)
Inventor
Harald Dittmann
Horst Pieper
Original Assignee
Continental Automotive Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Automotive Gmbh filed Critical Continental Automotive Gmbh
Publication of WO2010023257A1 publication Critical patent/WO2010023257A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512—Passenger detection systems
    • B60R21/0153—Passenger detection systems using field detection presence sensors
    • B60R21/01532—Passenger detection systems using field detection presence sensors using electric or capacitive field sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/002—Seats provided with an occupancy detection means mounted therein or thereon
    • B60N2/0021—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement
    • B60N2/0023—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement for detection of driver fatigue
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/002—Seats provided with an occupancy detection means mounted therein or thereon
    • B60N2/0021—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement
    • B60N2/0024—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement for identifying, categorising or investigation of the occupant or object on the seat
    • B60N2/0027—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement for identifying, categorising or investigation of the occupant or object on the seat for detecting the position of the occupant or of occupant's body part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/002—Seats provided with an occupancy detection means mounted therein or thereon
    • B60N2/0021—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement
    • B60N2/003—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement characterised by the sensor mounting location in or on the seat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/002—Seats provided with an occupancy detection means mounted therein or thereon
    • B60N2/0021—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement
    • B60N2/0035—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement characterised by the sensor data transmission, e.g. wired connections or wireless transmitters therefor; characterised by the sensor data processing, e.g. seat sensor signal amplification or electric circuits for providing seat sensor information
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2210/00—Sensor types, e.g. for passenger detection systems or for controlling seats
    • B60N2210/10—Field detection presence sensors
    • B60N2210/16—Electromagnetic waves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2230/00—Communication or electronic aspects
    • B60N2230/30—Signal processing of sensor data

Definitions

  • the invention relates to a device for detecting a change in position of vehicle occupants on a vehicle seat according to the preamble of claim 1 and a method for operating such a device.
  • the detection of a change in position for example, be helpful for airbag settings in the vehicle.
  • an occupant detection device which works with an antenna in the headrest and an electrode in the seat to detect the head position of a vehicle occupant on a vehicle seat. After detecting the head position, an automatic headrest adjustment takes place. An absolute value measurement of the capacitance takes place, from which a relative movement of the head of a vehicle occupant is determined.
  • the document DE 103 46 625 Al describes a device that analyzes the extension length of a tether and determines the movement of a person who is held on a vehicle seat by this tether.
  • the known devices have the disadvantage that only forward position changes of a vehicle occupant can be detected on a vehicle seat. A lateral change in position of the occupant, for example, by leaning on the passenger side is not registered.
  • the invention is therefore an object of the invention to provide a device that detects an out-of-position (OOP) position in all directions, ie, both in the prevention and the lateral leaning back, for example, the driver on the passenger side.
  • OOP out-of-position
  • the claimed device for detecting the position of vehicle occupants has at least one arranged in the vehicle seat electrode for transmitting a signal and at least one further electrode for receiving this signal, whereby a signal transmission between the electrodes is given.
  • the device has at least two receiving electrodes, it being possible to detect a change in position of the vehicle occupant by differential measurements of a signal of the first receiving electrode relative to a signal of the second receiving electrode. Differential measurements can be used to determine how the position of the driver is with respect to the first and the second receiving electrodes and a change of the position are detected.
  • any direction of movement can be detected.
  • the cheeks offer advantageous, since not only vertical, but also lateral changes in position of a vehicle occupant can be absorbed by the lateral arrangement of the electrodes on the seat. Further advantageous arrangements of the electrodes are possible in the seat backs and / or at further points of the vehicle seat, preferably in the nearer area of the occupant.
  • four receiving electrodes are arranged in the vehicle seat.
  • Particularly advantageous is the arrangement of two receiving electrodes on each side of the backrest, it is in each case an electrode above and a lower right and one each Electrode at the top and one at the bottom left. Due to the distribution on the sides of the seat, a detection of an OOP position in all directions, ie both forward and lateral and a combination of front and side possible.
  • the detection of any direction of movement has the advantage that both the airbag control can be regulated depending on the position of the vehicle occupant, as well as the information on a dual-view display, which is located in the side view of the driver, for example, in the middle of the cockpit , can be adjusted.
  • the invention allows the size of the reference signal level conclusions about the strength of the coupling and uncoupling of signals in or out of sitting on the seat vehicle occupants.
  • the electrodes are typically mounted directly in or on the respective seat, preferably in the seating surface of the seat and in the seat cheeks. For a particularly reliable coupling or decoupling of the signals is possible because the vehicle occupant position due to the proximity to the electrodes can be detected immediately upon change of position.
  • differential measurements of the signal for example, from an electrode of the left seat cheek to the reference electrode and the signal of an electrode of the right seat cheek to the reference electrode can determine whether and how much the occupant leans to one side or the other, that is, the position is changed laterally.
  • conclusions can be drawn as to whether and how much the occupant leans forward.
  • a combination of a lateral and a forward directional change can be detected by the arrangement of four receiving electrodes in the seat.
  • OOP positions can be detected. From this, conclusions can be drawn as to whether the occupant is approaching an airbag device, for example.
  • the airbag regulation can be adapted to the respective position of the vehicle occupant. For example, if the person is leaning forward and is thus in an OOP position near the airbag device, the firing force with which the airbag is triggered can be reduced or the airbag deployment completely suppressed. This can reduce a potential risk of injury from the impact of the airbag on the vehicle occupant.
  • the vehicle is a dual-view display, which has a separate viewing angle range for a driver and a passenger.
  • the driver Depending on the position of the occupants, it is possible for the driver to display information and interactions that are permitted in his field of vision and various information and interactions in the field of vision for the passenger. If, for example, a driver leaning towards the passenger is recognized, then the content displayed in the passenger channel can be adjusted, for example, restricted or completely switched off. In this way, information and interactions that are permitted for the driver in his field of vision and corresponding information and interactions in the field of vision of the passenger can be displayed.
  • Another application is the recognition of the driver's attention, as people with tiredness tend to drop their heads and shoulders forward.
  • the output of a signal (visual, audible or even vibration) can be caused, whereby the driver can recognize the position and correct or other measures can be initiated, such as a tightening of the belt or a limitation of engine power. This is advantageous for example in the pre-crash case, so as to avoid accidents.
  • transmitting and receiving electrodes for transmitting or receiving the signals are set up with an RF carrier frequency identical for the different signals.
  • the signal evaluation takes place via a demultiplexer.
  • the RF intensities of the individual signals are analyzed and output as the RF level.
  • the seating position can be determined.
  • an RF receiver amplifier and decoder
  • an analog multiplexer is the cheapest solution.
  • Fig. 1 side view, front view and top view of the electrode assembly in a vehicle seat
  • FIG. 2 shows a schematic representation of the measurement and evaluation of the RF levels
  • 3a-c is a schematic representation of the detection of the seating position by means of evaluation of the RF level; a forward positional change;
  • Fig. 3d-e a sideways position change.
  • Fig. 1 consists of three individual figures.
  • the left figure is a side view of a vehicle seat 3 with headrest 10, backrest 6 and a forward bent vehicle occupant 11 can be seen.
  • receiving electrodes 2 in the backrest 6 and a transmitting electrode 1 for transmitting a nes signal in the seating area 4 recognizable.
  • the electrodes are the main component of the device for detecting a change in position of vehicle occupants 11.
  • the arrows between the seat 4 and the backrest 6 show schematically a signal flow between the transmitting electrode 1 and the receiving electrodes 2 by the vehicle occupant 11.
  • the arrangement of the receiving electrodes 2 for receiving the signal emitted by the transmitting electrode 1 in the vehicle seat 3 is shown in a frontal view in the middle figure of FIG.
  • the receiving electrodes A, B, C and D are mounted in the vicinity of the sides of the backrest 6, wherein two electrodes 2 in the upper region, two in the lower region are respectively mounted on the left and right sides.
  • the right figure is a plan view of the seat surface 4 of the vehicle seat 4, in which the center of the transmitting electrode 1 is placed.
  • Sent signals of the transmitting electrode 1 are received by the receiving electrodes A-D 2 in the backrest 6 and evaluated. This is shown in FIG. 2.
  • the electrodes 2 receive different signal strengths, which have different heights as the RF level 9.
  • a change in position of the vehicle occupant 11 is detected by differential measurements of a signal of the first receiving electrode 2 to a signal of the second receiving electrode 2.
  • four receiving electrodes A-D 2 are arranged in the vehicle seat.
  • An arrangement of the receiving electrodes 2 in the cheeks of the seat surface 4 and / or seat backs and / or at other locations of the vehicle seat 3 is also possible.
  • the received signals are converted into RF level 9 via a demultiplexer 7 and an evaluation unit 8 and can be displayed in a display unit for clarity. the.
  • This level 9 is established for each individual receiving electrode 2 and is dependent on the seating position of the occupant 11. Examples of different RF levels 9 and thus different seating positions are shown in FIGS. 3 a to and are explained below. Arrows in the Fign. 3 b to e indicate here the direction of movement of the vehicle occupant 11.
  • the change in position of a vehicle occupant 11 is detected from the backrest 6 of the seat 3 to the front, to the side or a combination of the two directions of movement.
  • FIG. 3 a shows a sitting position of a vehicle occupant 11, with the back leaning against the backrest 6 and the head touching the headrest 10.
  • the RF level diagram 9 a maximum of the intensity can be seen for all receiving electrodes 2.
  • FIG. 3b shows a prevention of the vehicle occupant 11.
  • the electrodes 2 in the upper region of the seat 3 show a drop in the RF level 9. From this drop in level it can be concluded that the vehicle occupant 11 has left this position. If the occupant 11 completely slides off the backrest 6 (FIG. 3c), a drop in all HF levels 9 can be seen.
  • the system can now perform the seating position corresponding operations such as switching off the airbag or regulation of the firing force of the airbag.
  • the Fign. 3d and 3e show a lateral change in position.
  • the occupant 11 can lean, for example, in an upright position to one side (FIG. 3d) or to Preventing the position change laterally (Figure 3e), for example, to lean in the passenger area.
  • Possible reactions to this are that the displays are changed on a dual-view display or the airbag deployment is adjusted.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Air Bags (AREA)
  • Seats For Vehicles (AREA)

Abstract

The invention relates to a device for recognizing a position change of vehicle occupants (11), comprising at least one electrode (1) for transmitting a signal and at least one other electrode (2) for receiving the signal, said electrodes disposed in the vehicle seat (4), and a method for operating such a device. The position of the vehicle occupant (11) is determined through difference measurements of individual electrode signals relative to reference electrodes.

Description

Beschreibungdescription
VORRICHTUNG UND VERFAHREN ZUR ERKENNUNG EINER POSITIONSVERÄNDERUNG VON FAHRZEUGINSASSENDEVICE AND METHOD FOR DETECTING A POSITION CHANGE OF VEHICLE INITIALS
Die Erfindung betrifft eine Vorrichtung zur Erkennung einer Positionsveränderung von Fahrzeuginsassen auf einem Fahrzeugsitz nach dem Oberbegriff des Anspruchs 1 sowie ein Verfahren zur Bedienung einer solchen Vorrichtung. Die Erkennung einer Positionsveränderung kann beispielsweise für Airbageinstel- lungen im Fahrzeug hilfreich sein.The invention relates to a device for detecting a change in position of vehicle occupants on a vehicle seat according to the preamble of claim 1 and a method for operating such a device. The detection of a change in position, for example, be helpful for airbag settings in the vehicle.
Aus der Druckschrift DE 10 2005 057 806 Al ist eine Insassenerfassungsvorrichtung bekannt, die mit einer Antenne in der Kopfstütze und einer Elektrode im Sitz arbeitet, um die Kopf- position eines Fahrzeuginsassen auf einem Fahrzeugsitz zu de- tektieren. Nach der Erkennung der Kopfposition findet eine automatische Kopfstützenverstellung statt. Es findet eine Absolutwertmessung der Kapazität statt, aus der eine Relativbewegung des Kopfes eines Fahrzeuginsassen ermittelt wird.From the document DE 10 2005 057 806 Al an occupant detection device is known, which works with an antenna in the headrest and an electrode in the seat to detect the head position of a vehicle occupant on a vehicle seat. After detecting the head position, an automatic headrest adjustment takes place. An absolute value measurement of the capacitance takes place, from which a relative movement of the head of a vehicle occupant is determined.
Die Druckschrift DE 103 46 625 Al beschreibt eine Vorrichtung, die die Auszugslänge eines Haltegurts analysiert und daraus die Bewegung einer Person, die auf einem Fahrzeugsitz von diesem Haltegurt gehalten wird, ermittelt.The document DE 103 46 625 Al describes a device that analyzes the extension length of a tether and determines the movement of a person who is held on a vehicle seat by this tether.
Die bekannten Vorrichtungen haben den Nachteil, dass lediglich nach vorn gerichtete Positionsveränderungen eines Fahrzeuginsassen auf einem Fahrzeugsitz detektiert werden können. Eine laterale Positionsveränderung des Insassen beispielswei- se durch Hinüberlehnen auf die Beifahrerseite wird nicht registriert .The known devices have the disadvantage that only forward position changes of a vehicle occupant can be detected on a vehicle seat. A lateral change in position of the occupant, for example, by leaning on the passenger side is not registered.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Vorrichtung zu schaffen, die eine Out-Of-Position (OOP) -Position in allen Richtungen, d. h. sowohl beim Vorbeugen als auch beim seitlichen Hinüberlehnen beispielsweise des Fahrers auf die Beifahrerseite detektiert. Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale in Verbindung mit den Merkmalen der Oberbegriffe der unabhängigen Ansprüche gelöst.The invention is therefore an object of the invention to provide a device that detects an out-of-position (OOP) position in all directions, ie, both in the prevention and the lateral leaning back, for example, the driver on the passenger side. This object is achieved by the characterizing features in conjunction with the features of the preambles of the independent claims.
Die beanspruchte Vorrichtung zur Positionserkennung von Fahrzeuginsassen weist mindestens eine im Fahrzeugsitz angeordnete Elektrode zum Senden eines Signals und mindestens eine weitere Elektrode zum Empfangen dieses Signals auf, wodurch eine Signalübertragung zwischen den Elektroden gegeben ist. Die Vorrichtung weist mindestens zwei Empfangselektroden auf, wobei durch Differenzmessungen eines Signals der ersten Empfangselektrode zu einem Signal der zweiten Empfangselektrode eine Positionsveränderung des Fahrzeuginsassen detektierbar ist. Durch Differenzmessungen kann festgestellt werden, wie die Position des Fahrers in Bezug auf die erste und die zweite Empfangselektrode ist und eine Veränderung der Position detektiert werden.The claimed device for detecting the position of vehicle occupants has at least one arranged in the vehicle seat electrode for transmitting a signal and at least one further electrode for receiving this signal, whereby a signal transmission between the electrodes is given. The device has at least two receiving electrodes, it being possible to detect a change in position of the vehicle occupant by differential measurements of a signal of the first receiving electrode relative to a signal of the second receiving electrode. Differential measurements can be used to determine how the position of the driver is with respect to the first and the second receiving electrodes and a change of the position are detected.
Durch die in den Unteransprüchen angegebenen Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen möglich.The measures specified in the dependent claims advantageous refinements and improvements are possible.
Durch eine Anordnung von mindestens zwei Elektroden zum Empfangen des Signals in den Wangen der Sitzflächen kann jede beliebige Bewegungsrichtung detektiert werden. Die Wangen bieten sich vorteilhaft an, da durch die seitliche Anordnung der Elektroden am Sitz, nicht nur vertikale, sondern auch laterale Positionsveränderungen eines Fahrzeuginsassen aufgenommen werden können. Weitere vorteilhafte Anordnungen der Elektroden sind in den Sitzlehnen und/oder an weiteren Stel- len des Fahrzeugsitzes, vorzugsweise im näheren Bereich des Insassen möglich.By arranging at least two electrodes for receiving the signal in the cheeks of the seating surfaces, any direction of movement can be detected. The cheeks offer advantageous, since not only vertical, but also lateral changes in position of a vehicle occupant can be absorbed by the lateral arrangement of the electrodes on the seat. Further advantageous arrangements of the electrodes are possible in the seat backs and / or at further points of the vehicle seat, preferably in the nearer area of the occupant.
In einer vorteilhaften Ausführungsform der Erfindung sind im Fahrzeugsitz vier Empfangselektroden angeordnet. Besonders vorteilhaft ist die Anordnung von jeweils zwei Empfangselektroden auf jeder Seite der Rückenlehne, dabei ist jeweils eine Elektrode oben und eine unten rechts sowie jeweils eine Elektrode oben und eine unten links angeordnet. Durch die Verteilung an den Seiten des Sitzes ist eine Detektion einer OOP-Position in allen Richtungen, d. h. sowohl nach vorn als auch seitlich sowie eine Kombination aus vorn und seitlich möglich.In an advantageous embodiment of the invention, four receiving electrodes are arranged in the vehicle seat. Particularly advantageous is the arrangement of two receiving electrodes on each side of the backrest, it is in each case an electrode above and a lower right and one each Electrode at the top and one at the bottom left. Due to the distribution on the sides of the seat, a detection of an OOP position in all directions, ie both forward and lateral and a combination of front and side possible.
Die Detektion jeder beliebigen Bewegungsrichtung hat den Vorteil, dass sowohl die Airbagansteuerung je nach Position des Fahrzeuginsassen reguliert werden kann, als auch die Informa- tionen auf einem Dual-View-Display, welches sich im seitlichen Sichtbereich des Fahrers beispielsweise in der Mitte des Cockpits befindet, angepasst werden können.The detection of any direction of movement has the advantage that both the airbag control can be regulated depending on the position of the vehicle occupant, as well as the information on a dual-view display, which is located in the side view of the driver, for example, in the middle of the cockpit , can be adjusted.
Erfindungsgemäß erlaubt die Größe der Referenzsignalpegel Rückschlüsse auf die Stärke der Ein- und Auskopplung von Signalen in die oder aus den, auf dem Sitz sitzenden Fahrzeuginsassen. Die Elektroden sind typischerweise direkt in oder an dem jeweiligen Sitz angebracht, vorzugsweise in der Sitzfläche des Sitzes und in den Sitzwangen. Damit ist ein besonders zuverlässiges Ein- oder Auskoppeln der Signale möglich, da die Fahrzeuginsassenposition auf Grund der Nähe zu den Elektroden unmittelbar bei Veränderung der Position detektiert werden kann.According to the invention allows the size of the reference signal level conclusions about the strength of the coupling and uncoupling of signals in or out of sitting on the seat vehicle occupants. The electrodes are typically mounted directly in or on the respective seat, preferably in the seating surface of the seat and in the seat cheeks. For a particularly reliable coupling or decoupling of the signals is possible because the vehicle occupant position due to the proximity to the electrodes can be detected immediately upon change of position.
Durch Differenzmessungen des Signals beispielsweise von einer Elektrode der linken Sitzwange zur Referenzelektrode und des Signals einer Elektrode der rechte Sitzwange zur Referenzelektrode lässt sich bestimmen, ob und wie stark sich der Insasse zur einen oder anderen Seite lehnt, das heißt, die Position lateral verändert wird. Unter Einbeziehung des Signals von der einen oder mehreren Elektroden in den Sitzwangen lassen sich Rückschlüsse daraufhin ableiten, ob und wie stark sich der Insasse nach vorn lehnt. Auch eine Kombination einer lateralen mit einer nach vorn gerichteten Richtungsänderung kann durch die Anordnung von vier Empfangselektroden im Sitz detektiert werden. Erfindungsgemäß lassen sich durch die Nutzung einer oder mehrerer Signale oder Differenzmessungen OOP-Positionen detek- tieren. Daraus können Rückschlüsse gezogen werden, ob sich der Insasse beispielsweise einer Airbagvorrichtung nähert.By differential measurements of the signal, for example, from an electrode of the left seat cheek to the reference electrode and the signal of an electrode of the right seat cheek to the reference electrode can determine whether and how much the occupant leans to one side or the other, that is, the position is changed laterally. By including the signal from the one or more electrodes in the seat backs, conclusions can be drawn as to whether and how much the occupant leans forward. Also, a combination of a lateral and a forward directional change can be detected by the arrangement of four receiving electrodes in the seat. According to the invention, by using one or more signals or differential measurements, OOP positions can be detected. From this, conclusions can be drawn as to whether the occupant is approaching an airbag device, for example.
In einer bevorzugten Ausführungsform kann die Airbagregulie- rung auf die jeweilige Position des Fahrzeuginsassen ange- passt werden. Ist die Person beispielsweise vorgelehnt und befindet sich so in einer OOP-Position nahe der Airbagvor- richtung, kann die Schusskraft, mit der der Airbag ausgelöst wird, reduziert oder die Airbagauslösung ganz unterdrückt werden. Dies kann ein mögliches Verletzungsrisiko durch den Aufprall des Airbags auf den Fahrzeuginsassen verringern.In a preferred embodiment, the airbag regulation can be adapted to the respective position of the vehicle occupant. For example, if the person is leaning forward and is thus in an OOP position near the airbag device, the firing force with which the airbag is triggered can be reduced or the airbag deployment completely suppressed. This can reduce a potential risk of injury from the impact of the airbag on the vehicle occupant.
Eine weitere Variante zur Erfindungsausführung ist gegeben, wenn sich im Fahrzeug ein Dual-View-Display befindet, welches einen separaten Sichtwinkelbereich jeweils für einen Fahrer und einen Beifahrer aufweist. Es können je nach Position der Insassen für den Fahrer erlaubte Informationen und Interakti- onen in seinem Sichtbereich und diverse Informationen und Interaktionen im Sichtbereich für den Beifahrer dargestellt werden. Wird nun ein Hinüberlehnen beispielsweise des Fahrers hin zum Beifahrer erkannt, so lässt sich dann der im Beifahrerkanal dargestellte Inhalt anpassen, beispielsweise ein- schränken oder ganz abschalten. So können für den Fahrer erlaubte Informationen und Interaktionen in seinem Sichtbereich und entsprechende Informationen und Interaktionen im Sichtbereich des Beifahrers dargestellt werden.Another variant of the invention execution is given if the vehicle is a dual-view display, which has a separate viewing angle range for a driver and a passenger. Depending on the position of the occupants, it is possible for the driver to display information and interactions that are permitted in his field of vision and various information and interactions in the field of vision for the passenger. If, for example, a driver leaning towards the passenger is recognized, then the content displayed in the passenger channel can be adjusted, for example, restricted or completely switched off. In this way, information and interactions that are permitted for the driver in his field of vision and corresponding information and interactions in the field of vision of the passenger can be displayed.
Eine weitere Anwendungsmöglichkeit ist die Erkennung der Aufmerksamkeit des Fahrers, da Personen bei Müdigkeit dazu tendieren, Kopf und Schulter nach vorn fallen zu lassen. Durch eine Detektion dieses Zustandes kann beispielsweise die Ausgabe eines Signals (visuell, akustisch oder auch Vibration) hervorgerufen werden, wodurch der Fahrer die Position erkennen und korrigieren kann oder andere Maßnahmen eingeleitet werden können, wie beispielsweise eine Straffung des Gurtes oder eine Begrenzung der Motorleistung. Dies ist beispielsweise im Pre-Crash Fall vorteilhaft, um so Unfälle zu vermeiden .Another application is the recognition of the driver's attention, as people with tiredness tend to drop their heads and shoulders forward. By detecting this condition, for example, the output of a signal (visual, audible or even vibration) can be caused, whereby the driver can recognize the position and correct or other measures can be initiated, such as a tightening of the belt or a limitation of engine power. This is advantageous for example in the pre-crash case, so as to avoid accidents.
In einer bevorzugten Ausführungsvariante sind Sende- und Empfangselektroden zum Senden bzw. Empfangen der Signale mit einer für die verschiedenen Signale identischen HF-Trägerfrequenz eingerichtet. Die Signalauswertung erfolgt über einen Demultiplexer . Dabei werden die HF-Intensitäten der einzelnen Signale analysiert und als HF-Pegel ausgegeben. Mittels Bewertung der Signalpegel kann die Sitzposition bestimmt werden. Zur Auswertung ist es auch durchaus möglich, für jede Elektrode einen HF-Empfänger (Verstärker und Decoder) zu nehmen und zentral von einem MikroController auszuwerten. Ein Analog Multiplexer stellt jedoch die günstigste Lösung dar.In a preferred embodiment, transmitting and receiving electrodes for transmitting or receiving the signals are set up with an RF carrier frequency identical for the different signals. The signal evaluation takes place via a demultiplexer. The RF intensities of the individual signals are analyzed and output as the RF level. By evaluating the signal levels, the seating position can be determined. For evaluation, it is also quite possible to take for each electrode an RF receiver (amplifier and decoder) and centrally evaluated by a microcontroller. However, an analog multiplexer is the cheapest solution.
Die Vorrichtung zur Positionserkennung von Fahrzeuginsassen soll nun anhand einiger Ausführungsbeispiele näher erläutert werden. Es zeigen:The device for detecting the position of vehicle occupants will now be explained in more detail with reference to some embodiments. Show it:
Fig. 1 Seitenansicht, Frontansicht und Draufsicht der Elektrodenanordnung in einem Fahrzeugsitz;Fig. 1 side view, front view and top view of the electrode assembly in a vehicle seat;
Fig. 2 eine schematische Darstellung der Messung und Auswertung der HF-Pegel;FIG. 2 shows a schematic representation of the measurement and evaluation of the RF levels; FIG.
Fig. 3a-c eine schematische Darstellung der Erkennung der Sitzposition mittels Bewertung des HF-Pegels; eine nach vorne gerichtete Positionsveränderung;3a-c is a schematic representation of the detection of the seating position by means of evaluation of the RF level; a forward positional change;
Fig. 3d-e eine zur Seite gerichtete Positionsveränderung.Fig. 3d-e a sideways position change.
Fig. 1 besteht aus drei Einzelfiguren. In der linken Figur ist eine seitliche Ansicht eines Fahrzeugsitzes 3 mit Kopf- stütze 10, Rückenlehne 6 und einem nach vorn gebeugten Fahrzeuginsassen 11 zu sehen. Weiterhin sind Empfangselektroden 2 in der Rückenlehne 6 und eine Sendeelektrode 1 zum Senden ei- nes Signals im Sitzbereich 4 erkennbar. Die Elektroden sind Hauptbestandteil der Vorrichtung zur Erkennung einer Positionsveränderung von Fahrzeuginsassen 11. Die Pfeile zwischen Sitz 4 und Rückenlehne 6 zeigen schematisch einen Signalfluss zwischen der Sendeelektrode 1 und den Empfangselektroden 2 durch den Fahrzeuginsassen 11.Fig. 1 consists of three individual figures. In the left figure is a side view of a vehicle seat 3 with headrest 10, backrest 6 and a forward bent vehicle occupant 11 can be seen. Furthermore, receiving electrodes 2 in the backrest 6 and a transmitting electrode 1 for transmitting a nes signal in the seating area 4 recognizable. The electrodes are the main component of the device for detecting a change in position of vehicle occupants 11. The arrows between the seat 4 and the backrest 6 show schematically a signal flow between the transmitting electrode 1 and the receiving electrodes 2 by the vehicle occupant 11.
Die Anordnung der Empfangselektroden 2 zum Empfangen des von der Sendeelektrode 1 ausgesandten Signals in dem Fahrzeugsitz 3 ist in frontaler Ansicht in der mittleren Figur von Fig. 1 gezeigt. Die Empfangselektroden A, B, C und D sind in der Nähe der Seiten der Rückenlehne 6 angebracht, wobei jeweils zwei Elektroden 2 im oberen Bereich, zwei im unteren Bereich jeweils links- und rechtsseitig angebracht sind. Die rechte Figur ist eine Draufsicht auf die Sitzfläche 4 des Fahrzeugsitzes 4, in welchem mittig die Sendeelektrode 1 platziert ist. Somit ist ein Signalfluss durch einen, sich auf dem Sitz 4 befindenden Fahrzeuginsassen 11 gewährleistet.The arrangement of the receiving electrodes 2 for receiving the signal emitted by the transmitting electrode 1 in the vehicle seat 3 is shown in a frontal view in the middle figure of FIG. The receiving electrodes A, B, C and D are mounted in the vicinity of the sides of the backrest 6, wherein two electrodes 2 in the upper region, two in the lower region are respectively mounted on the left and right sides. The right figure is a plan view of the seat surface 4 of the vehicle seat 4, in which the center of the transmitting electrode 1 is placed. Thus, a signal flow is ensured by a vehicle occupant 11 located on the seat 4.
Ausgesandte Signale der Sendeelektrode 1 werden von den Empfangselektroden A-D 2 in der Rückenlehne 6 empfangen und ausgewertet. Dies ist gezeigt in Fig. 2. Durch das dargestellte Vorlehnen des Fahrzeuginsassen 11 empfangen die Elektroden 2 unterschiedliche Signalstärken, die als HF-Pegel 9 darge- stellt unterschiedliche Höhen aufweisen.Sent signals of the transmitting electrode 1 are received by the receiving electrodes A-D 2 in the backrest 6 and evaluated. This is shown in FIG. 2. As a result of the illustrated leaning of the vehicle occupant 11, the electrodes 2 receive different signal strengths, which have different heights as the RF level 9.
Eine Positionsveränderung des Fahrzeuginsassen 11 wird durch Differenzmessungen eines Signals der ersten Empfangselektrode 2 zu einem Signal der zweiten Empfangselektrode 2 detektiert. Dabei sind im Fahrzeugsitz 3 vier Empfangselektroden A-D 2 angeordnet. Eine Anordnung der Empfangselektroden 2 in den Wangen der Sitzfläche 4 und/oder Sitzlehnen und/oder an weiteren Stellen des Fahrzeugsitzes 3 ist ebenfalls möglich.A change in position of the vehicle occupant 11 is detected by differential measurements of a signal of the first receiving electrode 2 to a signal of the second receiving electrode 2. In this case, four receiving electrodes A-D 2 are arranged in the vehicle seat. An arrangement of the receiving electrodes 2 in the cheeks of the seat surface 4 and / or seat backs and / or at other locations of the vehicle seat 3 is also possible.
Die empfangenen Signale werden über einen Demultiplexer 7 und eine Auswerteeinheit 8 in HF-Pegel 9 umgewandelt und können in einer Anzeigeeinheit dargestellt zur Anschaulichkeit wer- den. So hat der Fahrzeuginsasse 11 mit Blick auf die HF-Pegel 9 jederzeit die Möglichkeit, seine Sitzposition zu optimieren. Dieser Pegel 9 wird für jede einzelne Empfangselektrode 2 erstellt und ist abhängig von der Sitzposition des Insassen 11. Beispiele für unterschiedliche HF-Pegel 9 und somit unterschiedliche Sitzpositionen sind in Fig. 3 a bis gezeigt und werden nachstehend erläutert. Pfeile in den Fign. 3 b bis e deuten hier die Richtung der Bewegung des Fahrzeuginsassen 11 an.The received signals are converted into RF level 9 via a demultiplexer 7 and an evaluation unit 8 and can be displayed in a display unit for clarity. the. Thus, the vehicle occupant 11 at any time with a view to the RF level 9, the possibility to optimize his seating position. This level 9 is established for each individual receiving electrode 2 and is dependent on the seating position of the occupant 11. Examples of different RF levels 9 and thus different seating positions are shown in FIGS. 3 a to and are explained below. Arrows in the Fign. 3 b to e indicate here the direction of movement of the vehicle occupant 11.
Durch Auswertung des Signals oder der Kombination mehrerer Signale und/oder Differenzmessungen wird die Positionsveränderung eines Fahrzeuginsassen 11 von der Rückenlehne 6 des Sitzes 3 nach vorn, zur Seite oder eine Kombination der bei- den Bewegungsrichtungen detektiert.By evaluating the signal or the combination of a plurality of signals and / or difference measurements, the change in position of a vehicle occupant 11 is detected from the backrest 6 of the seat 3 to the front, to the side or a combination of the two directions of movement.
Fig. 3a zeigt eine Sitzposition eines Fahrzeuginsassen 11, wobei der Rücken an die Rückenlehne 6 gelehnt ist und der Kopf die Kopfstütze 10 berührt. Im HF-Pegelschema 9 ist für alle Empfangselektroden 2 ein Maximum der Intensität zu sehen .FIG. 3 a shows a sitting position of a vehicle occupant 11, with the back leaning against the backrest 6 and the head touching the headrest 10. In the RF level diagram 9, a maximum of the intensity can be seen for all receiving electrodes 2.
Fig. 3b zeigt ein Vorbeugen des Fahrzeuginsassen 11. Die Elektroden 2 im oberen Bereich des Sitzes 3 zeigen einen Ab- fall des HF-Pegels 9. Aus diesem Pegelabfall ist zu schließen, dass der Fahrzeuginsasse 11 diese Position verlassen hat. Rutscht der Insasse 11 gar gänzlich von der Rückenlehne 6 ab (Fig. 3c), ist ein Abfall aller HF-Pegel 9 zu erkennen.3b shows a prevention of the vehicle occupant 11. The electrodes 2 in the upper region of the seat 3 show a drop in the RF level 9. From this drop in level it can be concluded that the vehicle occupant 11 has left this position. If the occupant 11 completely slides off the backrest 6 (FIG. 3c), a drop in all HF levels 9 can be seen.
Durch die Auswertung der HF-Pegel 9 kann das System nun der Sitzposition entsprechende Vorgänge wie das Abschalten des Airbags oder eine Regulation der Schusskraft des Airbags ausführen .By evaluating the RF level 9, the system can now perform the seating position corresponding operations such as switching off the airbag or regulation of the firing force of the airbag.
Die Fign. 3d und 3e zeigen eine laterale Positionsveränderung. Dabei kann der Insasse 11 sich beispielsweise in aufrechter Haltung zu einer Seite lehnen (Fig. 3d) oder nach einem Vorbeugen die Position seitlich verändern (Fig. 3e) , um sich beispielsweise in den Beifahrerbereich zu lehnen. Mögliche Reaktionen hierauf sind, dass die Anzeigen auf einem Dual-View-Display geändert werden oder die Airbagauslösung angepasst wird. The Fign. 3d and 3e show a lateral change in position. In this case, the occupant 11 can lean, for example, in an upright position to one side (FIG. 3d) or to Preventing the position change laterally (Figure 3e), for example, to lean in the passenger area. Possible reactions to this are that the displays are changed on a dual-view display or the airbag deployment is adjusted.

Claims

Patentansprüche claims
1. Vorrichtung zur Erkennung einer Positionsveränderung von1. Device for detecting a change in position of
Fahrzeuginsassen, enthaltend mindestens eine im Fahrzeug- sitz angeordnete Sendeelektrode zum Senden eines Signals und mindestens eine Empfangselektrode zum Empfangen des von der Sendeelektrode ausgesandten Signals, d a d u r c h g e k e n n z e i c h n e t , dass die Vorrichtung mindestens zwei Empfangselektroden enthält wobei durch Differenzmessungen eines Signals der ersten Empfangselektrode zu einem Signal der zweiten Empfangselektrode eine Positionsveränderung des Fahrzeuginsassen de- tektierbar ist.A vehicle occupant, comprising at least one transmitting electrode arranged in the vehicle seat for transmitting a signal and at least one receiving electrode for receiving the signal emitted by the transmitting electrode, characterized in that the device comprises at least two receiving electrodes wherein by differential measurements of a signal of the first receiving electrode to a signal of the second Receiving electrode, a change in position of the vehicle occupant can be detected.
2. Vorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , dass sich die mindestens zwei Empfangselektroden in den Wangen der Sitzfläche und/oder in den Sitzlehnen und/oder an weiteren Stellen des Fahrzeugsitzes befinden.2. Device according to claim 1, characterized in that the at least two receiving electrodes are located in the cheeks of the seat surface and / or in the seat backs and / or at other locations of the vehicle seat.
3. Vorrichtung nach einem der Ansprüche 1 oder 2, d a d u r c h g e k e n n z e i c h n e t , dass im Fahrzeugsitz mindestens vier Empfangselektroden angeordnet sind.3. Device according to one of claims 1 or 2, d a d u r c h e c e n e c i n e s in that at least four receiving electrodes are arranged in the vehicle seat.
4. Vorrichtung nach einem der vorgehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass durch Auswertung eines Signals oder Kombination mehrerer Signale und/oder Differenzmessungen eine Positionsveränderung des Fahrzeuginsassen detektierbar ist.4. Device according to one of the preceding claims, characterized in that a position change of the vehicle occupant can be detected by evaluating a signal or combination of a plurality of signals and / or differential measurements.
5. Vorrichtung nach einem der vorgehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass eine Positionsveränderung des Fahrzeuginsassen von der Rückenlehne des Sitzes aus nach vorn detektierbar ist.5. The device according to claim 1, wherein a change in position of the vehicle occupant from the backrest of the seat can be detected forwardly.
6. Vorrichtung nach einem der vorgehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass eine laterale Positionsveränderung des Fahrzeuginsassen detektierbar ist.6. Device according to one of the preceding claims, characterized in that a lateral Position change of the vehicle occupant is detectable.
7. Vorrichtung nach einem der vorgehenden Ansprüche, d a - d u r c h g e k e n n z e i c h n e t , dass ein Positionsveränderung als Kombination einer lateralen Bewegung in Verbindung mit einer Bewegung nach vorn detektierbar ist.7. Device according to one of the preceding claims, characterized in that a change in position as a combination of a lateral movement in conjunction with a forward movement is detectable.
8. Vorrichtung nach einem der vorgehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass die Schusskraft eines Airbags an eine Positionsveränderung des Fahrzeuginsassen automatisiert anpassbar ist.8. The device according to claim 1, wherein the firing force of an airbag can be automatically adapted to a change in position of the vehicle occupant.
9. Vorrichtung nach einem der vorgehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass ein Dual- View-Display im Fahrzeuginnenraum mit angezeigten Funktionen die ausgegebenen Informationen an eine Positionsveränderung des Fahrzeuginsassen automatisiert anpassbar ist.9. The device according to claim 1, wherein a dual-view display in the vehicle interior with displayed functions is capable of automatically adapting the output information to a change in position of the vehicle occupant.
10. Vorrichtung nach einem der vorgehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass die Sende- und Empfangselektroden eingerichtet sind zum Senden der Signale mit einer für die verschiedenen Signale identischen HF-Trägerfrequenz .10. The device according to claim 1, wherein the transmitting and receiving electrodes are set up to transmit the signals with an RF carrier frequency identical for the different signals.
11. Vorrichtung nach einem der vorgehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass zur Signal- auswertung ein Demultiplexer vorgesehen ist.11. Device according to one of the preceding claims, d a d u r c h e c e n e c e s in that a demultiplexer is provided for signal evaluation.
12. Verfahren zum Bedienen einer Vorrichtung zur Erkennung einer Positionsveränderung von Fahrzeuginsassen, enthaltend mindestens eine im Fahrzeugsitz angeordnete Sende- elektrode zum Senden eines Signals und mindestens eine12. A method for operating a device for detecting a change in position of vehicle occupants, comprising at least one arranged in the vehicle seat transmitting electrode for transmitting a signal and at least one
Empfangselektrode zum Empfangen des von der Sendeelektrode ausgesandten Signals, d a d u r c h g e k e n n - z e i c h n e t , dass in der Vorrichtung mindestens zwei Empfangselektroden vorgesehen werden, wobei durch Differenzmessungen eines Signals der ersten Empfangselektrode zu einem Signal der zweiten Empfangselektrode eine Posi- tionsveränderung des Fahrzeuginsassen detektiert wird.Receiving electrode for receiving the signal emitted by the transmitting electrode, dadurchgekenn - records that at least two receiving electrodes are provided in the device, wherein a position change of the vehicle occupant is detected by differential measurements of a signal of the first receiving electrode to a signal of the second receiving electrode.
13. Verfahren nach Anspruch 12, d a d u r c h g e k e n n z e i c h n e t , dass zur Auswertung der Signale HF-Pegel der einzelnen Empfangselektrodensignale analysiert werden.13. The method according to claim 12, characterized in that, to evaluate the signals, RF levels of the individual receiving electrode signals are analyzed.
14. Verfahren nach einem der Ansprüche 12 oder 13, d a d u r c h g e k e n n z e i c h n e t , dass mittels Bewertung der Signalpegel eine Positionsveränderung des Fahrzeuginsassen bestimmt wird.14. Method according to one of claims 12 or 13, characterized in that a change in position of the vehicle occupant is determined by means of evaluation of the signal level.
15. Verfahren nach einem der Ansprüche 12 bis 14, d a d u r c h g e k e n n z e i c h n e t , dass mittels Bewertung der Signalpegel ein Ermüdungsverhalten des Fahr- zeuginsassen erkannt wird, und Maßnahmen zur Steigerung der Aufmerksamkeit des Fahrers eingeleitet werden.15. The method according to any one of claims 12 to 14, wherein a fatigue behavior of the vehicle occupant is detected by evaluating the signal level, and measures to increase the driver's attention are initiated.
16. Verfahren nach einem der Ansprüche 12 bis 15, d a d u r c h g e k e n n z e i c h n e t , dass mittels Be- wertung der Signalpegel sicherheitskritische Positionen des Fahrzeuginsassen erkannt werden und korrektiv wirkenden Maßnahmen eingeleitet werden. 16. Method according to one of claims 12 to 15, characterized in that safety-critical positions of the vehicle occupant are detected by means of evaluation of the signal levels and corrective measures are initiated.
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DE102008044903A1 (en) 2010-03-04

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